Redsn0w 0.9.4 download is now available to unlock iPhone 3.1.3 firmware – and also works as a jailbreak Phone 3.1.3 tool.

The Dev Team released this tool at morning soon after the iPhone 3.1.3 update went live for public to update via iTunes. iPhone 3.1.3 update is more like a bug fix release which resolves some issues that were experienced in iPhone 3.1.2 firmware.